HOW COULD YOU, A MATHEMATICIAN, BELIEVE THAT EXTRATERRESTRIALS WERE SENDING YOU MESSAGES?" the visitor from Harvard asked the West Virginian with the movie-star looks and Olympian manner. "Because the ideas I had about supernatural beings came to me the same way my mathematical ideas did," came the answer. "So I took them seriously." Thus begins the true story of John Nash, the mathematical genius who was a legend by age thirty when he slipped into madness, and who--thanks to the selflessness of a beautiful woman and the loyalty of the mathematics community--emerged after decades of ghostlike existence to win a Nobel Prize for triggering the game theory revolution. The inspiration for an Academy Award-winning movie, Sylvia Nasar's now-classic biography is a drama about the mystery of the human mind, triumph over adversity, and the healing power of love.